package com.apache.netty.protocoltcp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;

import java.util.List;

public class MyMessageDecoder extends ReplayingDecoder<Void> {
  @Override
  protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
    System.out.println("MyMessageDecoder decode 被调用");
    // 需要将得到二进制字节码-> MessageProtocol 数据包(对象)
    int length = in.readInt();

    byte[] content = new byte[length];
    in.readBytes(content);

    // 封装成 MessageProtocol 对象，放入 out， 传递下一个handler业务处理
    MessageProtocol messageProtocol = new MessageProtocol();
    messageProtocol.setLen(length);
    messageProtocol.setContent(content);

    out.add(messageProtocol);
  }
}
